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8 PLANNING FOR RELEASE 11 AND BEYOND<br />
As work on 3GPP Rel-10 is nearing completion, focus is beginning on Rel-11 planning. This section<br />
provides a snapshot of the status of Rel-11 work as of the December 2010 3GPP RAN Plenary meetings,<br />
and significant progress on Rel-11 is expected in 2011 and beyond. The timeline for Rel-11 will first be<br />
provided, followed by an explanation of several of the LTE-specific enhancements, including Co-ordinated<br />
Multi-Point (CoMP), Carrier Aggregation enhancements and ICIC enhancements. The proposed<br />
enhancements to HSPA+ in Rel-11 will then be discussed including 8-carrier HSDPA, Uplink dual<br />
antenna beamforming and MIMO, and downlink multi-point transmission. Technology-agnostic<br />
enhancements such as Machine-Type Communications will then be examined and the section concludes<br />
by listing a few other areas that may be discussed in 2011 for possible inclusion in Rel-11 or beyond.<br />
8.1 TARGET TIMELINE FOR RELEASE 11<br />
The following Rel-11 timeline was agreed to:<br />
Stage 1 target: September 2011<br />
Stage 2 target: March 2012<br />
Stage 3 target: September 2012<br />
ASN.1 freeze: December 2012<br />
8.2 LTE‐ADVANCED ENHANCEMENTS<br />
8.2.1 COORDINATED MULTIPLE POINT TRANSMISSION AND RECEPTION<br />
Coordinated Multi-Point transmission/reception (CoMP) is considered by 3GPP as a tool to improve<br />
coverage, cell-edge throughput, and/or system efficiency. A study item has been initiated in 3GPP to<br />
evaluate this technology for Rel-11.<br />
8.2.1.1 PRINCIPLE<br />
The main idea of CoMP is as follows: when a UE is in the cell-edge region, it may be able to receive<br />
signals from multiple cell sites and the UE’s transmission may be received at multiple cell sites regardless<br />
of the system load. Given that, if the signaling transmitted from the multiple cell sites is coordinated, the<br />
<strong>DL</strong> performance can be increased significantly. This coordination can be simple as in the techniques that<br />
focus on interference avoidance or more complex as in the case where the same data is transmitted from<br />
multiple cell sites. For the UL, since the signal can be received by multiple cell sites, if the scheduling is<br />
coordinated from the different cell sites, the system can take advantage of this multiple reception to<br />
significantly improve the link performance. In the following sections, the CoMP architecture and the<br />
different CoMP schemes will be discussed.<br />
8.2.1.2 COMP ARCHITECTURE<br />
CoMP communications can occur with intra-site or inter-site CoMP as shown in Figure 8.1. With intra-site<br />
CoMP, the coordination is within a cell site and can be achieved in Rel-8/Rel-9/Rel-10 using non-<br />
www.4gamericas.org February 2011 Page 80
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